Printing-plate-securing means



3 Sheets-Sheet 1' L. W. CLAYBOURN PRINTING PLATE SECURING MEANS FiledDec. 27.

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1922 5 Sheets-Sheet 2 March 11 "192%..-

3&6323 L. w. CLAYBOURN PRINTING PLATE SECURING MEANS 3 Sheets-Sheet 3Patented Mar. iii, 19%...-

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Application filed December 27, 1922. Serial No. 609,287.

To all whom it may concern:

Be it known that I, LnsLn: W. CLAY- BOURN, a citizen of the UnitedStates, residing at Milwaukee, in the county of Milo waukeeand State of-Wisconsin, have invented certain new and useful 'Improvements inPrinting-Plate-Securing Means, of which the following is aspecification.

My invention relates to printing plate securing means ar anged forsecuring a printing plate by means of a hook device, the hook whereofcoacts with the edge of the printing plate and the body whereof isshiftable in a groove in a suitablebase,

which may take the form of a block, plate bed or plate cylinder.

It is the object of my invention to provide new and improved meansbetween the walls of the groove and the body of the hook-member wherebyaccuracy is increased; further, to provide new and im-' proved meanswhereby to maintain the hookdevice in the groove; further, to providenew and improved means whereby ready movement of the hook device in thegroove is obtained; further, to provide new and improved H1( .ns wherebythe moving force applied to the traveling hook-device is dis-. tributedalong the length thereof; further, to provide new and improved meanswhereby ready assembling of the parts is obtained; further, to providenew and improved means whereby the number of parts in a device of thischaracter is minimized;

relations of parts whereby friction between the Walls of the groove andthe traveling hook-device is minimized.

The invention will be further readily understood from the followingdescription and claims, and from the drawings, in which device, with thehook-member arranged parplied to a and, further, to provide new andimproved allel .with the body, and showing the base in sect-ionlongitudinally of the groove on the line 44 of Fig. 3. I

Fig. 5 is a OI'OSS-SQCtlOII of the same, taken in the plane of the line5--5 of Fig. 4.

Fig. 6 is a longitudinal section of my improved device, taken in the,plane of; the line 6-6 of Fig. 5.

Fig. 7 is a plan view of my improved device, with thevbase partly brokenaway, and showing the hook-member extending diagonally of the groove.

Fig. 8 is ahorizontal section of the .same, taken in the plane of theline 8-8 of Fig. 3. Fig. 9 is a similar view, showin the wing memberheld longitudinallyof the groove.

Fig. 10 is a. horizontal section of my improved device, taken in theplane of the line 10-10 of Fig. 4.

Fig. 11 is a perspective View of the various parts of my improved devicein separated relation.

Fig. 12 is a side elevation of my' 1111- proved traveling hook device.

Fig. 13 is an end elevation of the same.

Fig. 14 is a perspective view of my improved operating key; and, 0

Fig. 15 is "a detail view in cross-section, on the line 15-15 of Fig.11.

I have exemplified my invention as apprinting-plate cylinder, althoughthe same may be applied to a fiat bed or to blocks which are assembledto make up a form from which to print.

A suitable plate-cylinder is exemplified at 21. It is provided withgrooves 22, which are helically arranged about the cylinder in thecylindrical plate-supporting surface 23 of the cylinder.

The side walls 24 of the grooves are preferably adjacent, their outerends provided with ledges 25 which project toward each other. Theseledges are examplified as formed by means of slots 26 in the respec- Itive side walls of the grooves. v

The inner or bottom ends of the grooves are provided with opposite slots27. A rackbar 28, having a rack '29 thereon, .isnin the inner end of.the groove, the side edges of the rack-bar being received in the innerside slots 27 The rack-bar forms a bottom wallfor the groove. The teethof the rack areshown flush with the top of the rack-bar.

In .the form shown, the ledges 25, the slots 26 and 27, the rack-bar 28,the rack 29, and the side walls and the bottom wall ofthe groove arehelical, and have the same lead. The helices of the outer portions ofthe groove are described on cylindrical planes of greater diameter thanthe diameters of the cylindrical planes on which-the helices of theinner portions of the grooves are described. The outer portions of thegroove have therefore a greater helix angle than the inner portions. Thehelix angle increases toward the outer end of the groove, or, as thegroove approaches the cylindrical plate-supporting surface of theplate-cylinder. As a consequence there is a slant or twist to the sidewalls of the groove, from bottom to top of the groove, as shown at 30,in the length of the traveling hook device hereinafter described.

Atraveling hook device 31 is located in the groove, a suitable number ofthese hook devices for the grooves being provided so that a printingplate, exemplified at 32, or any suitable number of printing plates, maybe secured to the plate-support, exemplified as the cylinder 21. Theprinting plate is exemplified as a curved printing plate, having aprinting surface 33, and edges 34 suitably formed, as by beveling thesame, for being held by the hook device.

lFlat plates may also be held by .my improved device, in which case aplate bed or flat blocks are employed, having diagonal grooves therein,in .which the correspondingly formed hook devicesare received.

The traveling hook device comprises a body 37 and a hook-member 38,which latter, in the present instance, comprises a plateholding hook 39.A wing-member comprising wings 40 is provided. There is a shank 41between the hook and the wings, forming a journal in a bearing 42 in thebody. The combined hook and wing member is shown as an integralstructure ahd preferably has a central bore 45,'which forms a bearingfor the hub 46 of a bevel-gear 47, the head 48 of the bevel-gear beingjournaled in a hearing 49 andprovided with a shoulder 50, which coactswith the wing-member, to limit upward movement between the bevel-gearand the combined hook and wing-member.

' The bevel-gear is provided with turning means, for instance, a socket52 of polygonal cross-section, which has an opening '53 through thebottom of the'bevel-gear shown as a square socket, for receivingthecorrespondingly formed entering end 54 of an operating key 55, having aknurled operat-- ing end 56 and a handle 57, for rotating the same andthereby rotating the bevel-gear. The knurled operating end is for. rapidspinning of the bevel-gear, and the handle aaeaees for slower rotationof the same, for instance, when seating the hook on the printing plate.The handle end of the operating key is provided with a cross-slot 58,arranged to be received over the hook 39, for turning the combined hookand wing-member, the side walls of the slot engaging the respectivefront and rear ed es of the hook. The comwing-member having a face inthe form preferably of a truncated frusto-cone. 1 These rounded facesare shown as the upper faces of the wings, and are arranged to coactwith the lower faces of the ledges. These lower faces are helicallengthwise of the ledges, and in cross-section are preferably formeddrooping toward their outer ends, preferably of cross-sectional form tocorrespond with the conical faces of the wings, shown at the top of thewings.

The upper faces of the wings and the lower faces of the ledges coacttoretain the traveling hook device within the grooves, to preventaccidental movement of the hook devices out of the grooves and to holdthe hook devices to the plate-cylinder, so that the printing plate maybe firmly secured to the plate-cylinder by means of the hook devices.The contact between the coacting faces of the wines and the ledges isprefer.- ably such as to form a line-contact between the upper faces ofthe wings and the lower faces of the ledges,'to provide ready move mentbetween the wings and the ledges when turning the wings, and also torelieve friction and provide ready movement of the wings lengthwise ofthe ledges. I The linecontact is'obtained by having the upper face ofthe wing, which is of greatercurvature,

coact with the helical lower face of the ledge,

which is of less curvature, lengthwise of the groove, than the curvatureof the upper face of the wing.-

The body is provided with a cavity 64, the lower face of whose upperwall is preferably formed to correspond with the curvature of the upperfaces of the wings received therein. This cavity is preferably adjacentto the top of the body for forming a shallow roof 66 above the cavity.

The wing-member has abbreviated or truncated sides 67, so as to form thewingmember of greater length than width, the wingmember being positionedlengthwise of the body and groove and preferably within the body when itis desired to insert a traveling. hook device into or out of a .ings.

groove. The side walls of the cavity in the body are provided with slots68, through which the wings extend when the wingmember is rotated tohave the wings received under the ledges for holding the hook device tothe cylinder.

Means are provided to preferably automatically hold the wings under theledges, so as to avoid the dropping of the hook device or accidentalremoval thereof out of the groove, and for holding the hook 39 inposition to engage the right angle edges of a printing plate, wherebythe hooks extend substantially diagonally crosswise of the grooves. Thehooks preferably extend parallel with the wings.

A resilient holding means is provided,

which comprises a plunger 70, shown as a balland a spring 71,.which isarranged to normally urge the plunger towardthe wing. The body isprovided with a recess 72, in

which the plug and the spring are received.

The recess is provided with an apertured end wall 73, which holds theball in the recess and through which the ball projects into contact withthe wing-member.

The plunger is arranged to contact the rounded edge of the wing tomaintain the wing-member in any angular position or parallel with thebody, in which the wingmember may be manually placed, or to contact thetruncated edge of the wing-member. When the plunger is caused to contactthe truncated edge, in which relation the projecting edges of the wingsare definitely loc'ated under the ledges 25, additional turning forcemust be applied to the combined hook and wing-member to turn the same,for the reason that the corner between the truncated edge and therounded edge of the wing-member must first force back the ball resistedby the pressure of the spring before the rounded edge will ride alongthe plunger. The wing-member may be rotated to present either wing tothe plunger.

The combined hook and wing-member may be manually turned by means of thehook against the resistance of the spring in either direction, so as tob parallel with the body, for removal of the hook device or forplacement in anydesired position in one of the grooves, (see Figs. 4, 5,6, 9, 10, 12 and 13), and after insertion in one of the grooves, thecombined hook and wing-member may be turned so that the hook will co actwith the edge of a printing plate on the support, (see Figs. 1, 3, 7 and8), it being understood that the edges of the printing plates may extendindifferent directions, for instance as shown in Fig. 1 of the draw-Pressure of the plunger against the edge of the wing maintains thewing-memher in adjusted position and maintains the wing-member crosswiseof the groove under the ledges. The slightest turn of the wingth forceapplied in moving the hook'de-" vice toward the printing plate, theplunger yielding to this force in case such movement of the hook towardthe printing plate causes rotation of the hook on its upright axis.

A shaft is journaled in the body in end-bearings 81 and a median bearing82, preferably below th wing-member. Helical gears 83, 84. are fixed tothe shaft, there being preferably a pair ofthese helical gears. spacedapart, with the upright axis of the bevel-gear 4,-7 between them. .Abevel-gear 85 is fixed to this shaft between the helical gears 83, 84:,and meshes with the bevel-gear 47. The helical gears form worm gearswhich mesh with the rack 29, which is shown of worm form.

This arrangement distributes the" forces applied for moving thetraveling hook device, lengthwise of the hook device, and aids in caseof roovement of the hook device k -t ise o the groove, while shiftingthe hook device either forward or back. In this arrangement theoperating means for causing shifting of the hook device in the groove islocated on an upright axis between the pair of helical gears, and thewings contactthe ledges at points between the outer ends of the pair ofhelical gears, so as to hold both of the helical gears in full meshingrelation with the rack.

To further aid in the ease of movement of the traveling hook device andthe distribution of the moving forces therefor, the lower face of thebody is provided with a riding face 87 whichcoacts with the upper faceof the rack-bar. as shown in Figs. 3 to 6 inclusive, this riding facebeing preferably helical when the grooves are formed in a platecylinder, as exemplified.

Th toothspaces in the rack are shown cut into the rack-bar, and thelower face of the body as riding on the upper face of the rack-bar andteeth.

The form of the lower face of the body which I prefer when used in aplate-cylinder, is shown in Figs. 3, 5, 11, 12 and 13 as helical. It maybe produced by grinding by means of a grinding wheel having acylindrical grinding face of a diameter preferably not greater thantwice the radius of the plate-cylinder from its axis to the closestpoint in the riding surface of the rack-bar,

' body with slanting faces 91, 92, extending lengthwise of the body andat diagonally opposite corners, providing clearance for a groove formedon a left-hand spiral, as

shown. The opposite ends of the side walls of the body are preferablyprovided with slanting faces 93, 94;, extending lengthwise of the bodyand at diagonally opposite corners, providing clearance for a grooveformed on'a right-hand spiral, or for additional clearance.

The lower edges of the side walls of the body are preferably providedwith parallel positioning faces 95, 96, for contacting the lower ends ofthe side walls of the groove, the slanting faces 91, 92, or 93, 94:,providing clearance in the body for the twisting 30 of the side walls 24of the groove above said lower edges. The side walls of the body areprovided with positioning faces 97, 98, extending above said lowerpositioning faces 95, 96, and between the respective clearance spacesformed by'the slanting faces 91, 93, and 92, 94. The body of thetraveling hookmember is therefore preferably provided with lower sidepositioning faces and with median upright positioning faces, insubstantially the form of an inverted T,. to

maintain the ,body parallel with the groove. b

The upper face of the body has slanting faces 99, 100, which slantdownwardly and outwardly toward diagonally opposite cor ners of the bodyto provide clearance so that the top of the body does not extend abovethe groove when a helical groove is employed.

T preferably make the traveling hook de vice in as few parts aspossible, and for this reason I prefer to form the hook-member and thewing-member as an integral structure, having the journal for rotatinglysupporting the same thereon, and form the shaft, the pairof helicalgears and thebevel-gear thereon as an integral structure, a furtherintegral structure beingthe upright bevelgear and its operating shank orhub, making a total of three major moving parts in a the body. I

In order to provide for readily assembling these parts in the body, andto enable few moving parts to be employed, ll form the body in sections,exemplified as two sections, 106, 107, the parting plane 108 between themasses sections being substantially coincident with the plane in whichthe axes of rotation of the combined hook and wing-member and the shaftare located. Each of the sections is provided with the bearing-halvesfor the shaft, for the shank or journal of the combined hook andwing-member, and for the head of the upright bevel-gear, the sectionsalso being provided with the respective halves of the cavities 109 forthe helical gears and the horizontal bevel-gear 85.

The sections are preferably duplicates of each other and areinterchangeable, so that any section may be used atv one side or theother side of the body. Each section is also preferably provided withone of the recesses 7 2, so that the plunger and its spring may beplaced at either end of the Wing-member.

The sides of these recesses are open at the meeting plane between thesections, as shown 6 ball.

Contact between the ends of the helical gears and the end walls of thecavities therefor in the body-sections, positions the shaft, the helicalgears and the lower bevel-gear axially, for causing proper and closemeshing relation between the bevel-gears and between the helical gearsand the rack. The shaft, the helical gears and the bevel-gears arepreferably located below the wing-mem- Shoulder-screws 114 are arrangedto firmly secure the body-sections together and to properly relativelylocate the same, the heads of the screws being preferably received inholes 115. in the body-sections. There are preferably two of thesescrews employed, extending in opposite directions crosswise at therespective ends of the body. The head-end of each screw is journaled inone body-section and its threaded end is respective ends of the body.

My improved device is simple in construction, durable, and of few parts,and the travthreaded into the other body-section at the 4 eling hookdevice is readily and accurately movable lengthwise of the groove forproviding a simple, economical, strong and durable registering hookdevice for printing plates.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent. is:

1. In a traveling hook device, the combination of a body having a cavityextendmesses ing throughout the width of said body and provided withslots opening into said cavity from the side walls of said body, and arotatable combined hook and wing-member comprising wings in said cavityarranged to project through said slots.

- 2. In a traveling hook device, the combination of a body having acavity in its top throughout the width of said body and provided withslots opening into said cavity from the side walls of said body, 1dforming a shallow roof for said cavity at the upper end of said body,and a combined hook and wing-member comprising wings and having a shankbetween the hook and wings thereof journaled in said roof, said memberrotatable for locating said wings lengthwise of said body or crosswiseof said body and extending through said slots.

3. In a traveling hook device, the combination of a body having a cavityin its top throughout the width of said body and provided with slotsopening into said cavity from the side walls of said body and forming ashallow roof for said cavity at the upper end of said body, a combinedhook and wing-member comprising wings and having a shank between thehook and wings thereof journaled in said roof, said member rotatable forlocating said wings lengthwise of said body or crosswise of said bodyand extending through said slots, and means resiliently holding. saidwings crosswise of said body.

4. In a traveling hook device, the combination of a body having a cavityextending throughout the width of said body and provided with slots 0ening into said cavity mm the side walls 0 said body, a rotatablewing-member comprising wings in said cavity arranged to project throughsaid slots,

and gearing means on said body causingtravel of said body.

5. In a traveling hook-device, the combinationof a body having a cavityextending throughout the width of said body and provided with slotsopening into said cavity from the side walls of said body,'a rotatablewing-member comprising wings in said cavity arranged to project throughsaid slots, and a gear under said wing-member arranged for receiving anoperating tool atthe top oi said wing-member.

6. In a traveling hook device, the com bination of a body, a. combinedhook and wing-member j ournaled'in the upper portion of. said body,gearin journaled in the lower portion of Sfi-ld bo y under said combinedhook and wing-member, and caring be tween said combined hook andwmg-member and said first-named gearing.

7. In a traveling, hook device, the combination of a body, a wing-memberfor coaction with a base, said wing-member ourgearing in said body undersaid wing-member for coaction with said base.

8. In a traveling hook device, the combination of a body, a. wing-memberfor coaction with a base, said wing-member journaled in said body on anupright axis, gearingin said body undersaid wing-member for coactionwith said base, and means for operating said gearing extending throughsaid wing-member.

9.. In a traveling hook device the combination of a body, a combinedhook and wing-member comprising a hollow journal, a bearing therefor inthe upper portion of said body, and gearing for coaction with a baselocated in the lower portion of said body and comprising a gear with anupright of said combined hook and wing-member,

and said hub formed to receive an operating tool for rotating saidgearing.

11. In a traveling. hook device, the combination of a body, a combinedhook and wing-member journaled in'the upper portion of said body on anuprightaxls and provided with a bore, a shaft journaled in the lowerportion of said bodylengthwise of the direction of travel of said body,spacedapart gears threon for coaction with a base, an intermediate gearon said shaft between said first-named gears, and a gear having anupright axis meshing with said lastnamed gear and journaled in saidbore.

'12. In a printing late securing means, the combination of a aseprovided with a groove, a rack therein, and a traveling hook devicecomprising a body, spaced-apart gears journaled therein coacting withsaid rack, said gears spaced apart in the direction of travel of saidbody, gearing for operating said spaced-apart gears intermediate betweensaid spaced-apart gears and comprising an upri ht gear, means whereby torotate said-uprig t gear, and a rotatable hook-member, said upri ht gearand said rotatable hook-members aving 'coincldent axes of rotation insaid body.

13 In a printing plate securing means, the combination of a baseprovided with a groove, a rack on the lower wall of said.

- naled in said body on an upright axis, and, of said body, a bevel-gearbetween said,

spaced-apart gears for operating the same, itnd an upright bevel-gearmeshing with the atter.

'14. A traveling hook device comprising a a rotatable wing-membercomprising wings, said wings provided with faces which are a.substantial frusto-cone, a shaft, spacedapart helical gears on saidshaft, a bevelgear on said shaft, an upright bevel-gear meshingtherewith, the axes of rotation of said rotatable wing-member, saidupright bevel-gear andsaid shaft being in substan-' lane, and a bodycomprising a pair of sections having a parting line in substantially theplane of said tially the same upright axes of rotation, each of saidsections having bearings and recesses therein which mate each other whenassembledand accommodate said parts mentioned. 1

15. A traveling hook device comprising a rotatable hook and wing-memberhaving a journal-shank between the hook and wings thereof, a shafthaving an axis of rotation substantially at right angles to the axis ofrotation of said combined hook and wingmember, spaced-apart helicalgears on said shaft, a bevel-gear on said shaft between saidspaced-apart helical gears, an upright bevel-gear having an axis ofrotation sub-- 'stantially coincident with the axis of rota tion of saidcombined hook and wing-member, said bevel-gears being in mesh with .eachother, and a body comprisinv'mating sections having a parting line tere-between in substantially the plane of said axes of rotation andrespectively provided with hearings in which said shaft and said shankare journaled and with recesses in which said spaced-apart helical gearsare received.

16. A traveling hook device comprising a combined hook and wing-memberprovided with a bore and a journal-shank between the hook and wingsthereof, a bevelgear journaled in said bore on an upright axis, a shafthaving an axis of rotation at substantially right angles to the axes ofrotation of said bevel-gear and said hook andv wingsmember, spaced aparthelical gears on said shaft, abevel-gear on said shaft between saidhelical gears meshing with said first-named bevel gear, and a bodycomprising sections having a parting line between them in substantiallythe plane in which said axes of rotation are located and respectivelyprovided with bearinghalve's for said shank, said first-named bevel-gearand said shaft and with mating recesses in which said spaced-aparthelical gears are located.

' 17. A travelinghook device comprising a combined hook and wing-memberprovided with a bore and a journal-shank'betweenthe hook and wingsthereof, a bevel-gear! journaled in said bore 01f an upright axis astantiauy right angles to the axes of ro 'combin'atlon of a base calgroove having a helical ledge. at each side thereof, said led espresented toward each messes tion of said bevel-gear and said hook andwing-member, spaced-apart helical gears on said shaft, a bevel-gear onsaid shaft between said helical gears meshing with said first-namedbevel gear, a body comprising sections having a parting line betweenthem in substantially the plane in which said axes of rotation arelocated and respectively provided with bearing-halves for said shank,said first-named bevel-gear and said shaft, and with mating recesses inwhich said spaced-apart helical gears are located,- and means forsecuring said sections together.

18. A traveling hook device comprising a combined hook andwing-men'lber, an upright bevel-gear journaled therein, a ho'ri zontalshaft, spaced-apart helical gears thereon, a bevel-gear on said shaftmeshing with said upright bevel-gear between said spaced-apart helicalgears, -a springpressed plunger coacting with said wingmember, and abody having recesses for said aforementioned elements and compressingduplicate sections having a u'lating plane vice in said groove, aretaining wing there-v on, and means whereby to shift said winglaterally for location thereof under said ledge, the upper face of saidwing being rounded and arranged to contact the lower face of said ledgewith a line-contact to retain said traveling hook device in said groove.

,20. In printing plate securing means, the combination of a baseprovided with a helical groove having a helical ledge provided with anunder outwardly drooping helical contact-face, a traveling hook devicein said groove, and a rotatable retaining wing thereon provided with anupper rounded contact-face contacting said under helical contact-face. i

21. In printing plate securing means, thecombination of a base rovidedwith a helical groove having a hehcal ledge at each sidespective sidesofsaidtraveling hook device,

and said wings having rounded upper faces coacting with said undercontact-faces, whereby line-contacts are had between said contact-faces.

22. In printing plate securing means, the

other and provi ed with under outwardly provided with a helidroopinghelical contact-faces, 'a traveling hook device in said groovecomprising a rotatable hook member, wings movable therewith, and meansto arrest said wings in a plurality of rotative positions, said wingshaving rounded upper contact-faces coacting with said undercontact-faces, whereby line-contacts are had between said respectivewings and said respective under contact-faces in said respectivewing-positions.

23. In a printing platesecuring means, the'combination of a travelinghook device comprising a retaining wing having an upper rounded face,and a base provided with a groove in which said traveling hook device 1srecelved, said groove having a ledge provided with a concave face ofless curvature lengthwise of said groove than the curvature of saidrounded face, whereby 'coaction between said faces is obtained with aline-contact.

24. In printingplate securing means, the combmation of a base providedwith a groove having a ledge, a traveling hook de-' ed plunger toreleasably hold said retaining wing crosswise of said groove.

25. In printing plate securing means, the combinatlon of a base providedwith a groove having ledges resented toward each other, 'a traveling hoo-device comprising a body in said groove and a wing-member in said body,said wingmember provided with oppositely extending wings arranged to beplaced lengthwise of said body for moving said body into and out of saidgroove and crosswise of said body for placing said wings under saidledges, and resilient means to hold said wings under said ledges.

26. In printing plate securing means, the combination. of a baseprovided with a groove having ledges presented toward each other, atraveling hook device comprising a to'move said wings obstructinglyundersaid led es to maintain said body in said groove.

2%. In printing plate securing means, the combination of a baseprovided. with a groove having ledges projecting toward each other, atraveling hook device comprising a bod in said groove and a rotatablecombined 00k and wing-member comprisof said body.

of said body into and out of said groove and crosswise of said body,said wing-member provided with a rounded edge and-with a truncated edge,and resilient means coacting with said edges to maintain saidwing-member in adjusted positions.

28. In printing plate securing means, the combination of a base providedwith a helical groove and a traveling hook device in said groove, saidtraveling hook device comprising a body having side recesses at itsouter ends to provide clearances for the side walls of said helicalgrooves, and guiding means at its inner end guided by said side walls.

29. In a printing plate securing means, the combination of aplate-cylinder provided with helical grooves respectively having helicalside walls and a helical bottom wall, helical ledges presented towardeach other at the outer ends of said side walls, and a traveling hookdevice comprising a body in said groove provided with a bottom having ahelical riding face coacting with said helical bottom wall, and arotatable wing-member rotatable in said body provided with wings havinga rounded upper contact-face arranged to be received under said ledges.

.30. In a printing plate securing means,

the combination of a base provided with a .tom of each of said sidewalls, and'a laterally outwardly extending slot adjacent the top of eachof said side walls for forming oppositely projecting ledges at the topof said groove projecting toward each other, a rack-bar in the bottom ofsaid groove whose side edges are located in said first-- named slots, atraveling hook device in said groove comprising a body, a worm rotatabletherein and coacting with the rack of said rack-bar, a combined hook andwingmember comprising oppositely extendin wings, and means whereby torotate said last-named member to locate the wings thereof in saidsecond-named slots under said ledges.

31. A traveling hook device comprising a body the upper portions ofwhose diagonally opposite ends .are recessed at their sides. I

i 32. A traveling hook device comprising a body the upper portions ofwhose diagonally opposite ends are'recessed at their sides and whosebottom is provided with an upward median recess.

33. traveling hook device comprising a body the upper portionsof whosediagonally opposite ends are recessed at their sides and whose upperface slants in o posite diagonal directions from the midd e portion 34.A traveling hook device comprising a body the upper portions of Whosed1ag0- nally opposite ends are recessed at their sides, and retainingwings at the median upnally opposite ends are recessed at their si esand Whose bottom" is provided with an upward median recess, andretaining Wings at the upper median portion of said body.

36. A traveling hook device comprising a body whose side walls areprovided with contact-faces substantially in the form of an inverted T.

37. A traveling hook device comprising a body whose side Wallsareprovided with contact-faces substantially in the form of an invertedT, andwhose bottom face is up wardly recessed in its median portion.

38. In a printing plate securing means, the combination of a travelinghook device comprising a body, and a base provided with a helical groovewhose sidewalls have the same lead from top to bottom, the helixangle'of said side walls increasing from bottom to top, whereby saidside walls have a twist inthe length of said body received in saidgroove, and the upper. portions of the sides of the diagonally oppositeends of said body being reduced toform clearance spaces for said sidewalls. 1

39. In a printing plate securing means,

the combination of a traveling hook device comprising a body, and a baseprovided with a helical groove Whoseside Walls have the same lead fromtop to bottom, the helix angle of said side walls increasing from bottomto top, whereby said side walls have a twist in the length of said bodyreceived in said groove, the bottom of said groove being a helixdescribed on a cylinder, the upper portions of the sides of thediagonally oppo-.

site ends of said body being reduced to form clearance spaces for saidside walls, and the bottom face of said body being recessed at itsmiddle ,portion to accommodate said bot tom.

In testimony whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

LESLIE W. CLAYBOURN. In presence ofa FRANK A. KRUEGER, Pawn 6. June.

